package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //1.检验手机号是否符合
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合,返回错误信息
            return Result.fail("手机号格式错误!");
        }

        //3.如果符合,生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);


        //5.发送验证码
        //log.debug("发送短信验证码成功,验证码:{}");
        log.info("发送验证码成功,验证码:{}", code);

        //6.返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.检验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合 返回错误信息
            return Result.fail("手机号格式错误!");
        }

        // 3.从redis获取验证码并校验
        String code = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String userCode = loginForm.getCode();
        if (code == null || !code.equals(userCode)) {
            //3.不一致,报错
            return Result.fail("验证码错误!");
        }

        //4.一致,根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user == null) {
            //6.不存在,创建新用户并保存
            user = createUserWithPhone(phone);
        }

        // 7.存在,保存用户到redis
        // 7.1随机生成token,作为登录令牌
        String token = UUID.randomUUID().toString(true);

        //7.2将user对象转为hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,filedValue) -> filedValue.toString()));

        // 7.3存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token,userMap);
            //设置有效时间
        stringRedisTemplate.expire(LOGIN_USER_KEY + token,LOGIN_USER_TTL,TimeUnit.DAYS);

        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+ keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis  setBit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+ keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止到今天为止的所有的签到记录
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0){
            return Result.ok(0);
        }
        //6.循环遍历
        int count = 0;
        while (true) {
            //6.1让这个数字与1做与运算,得到数字的最后一个bit位   //判断这个bit位是否为0
            if ((num & 1) == 0){
                //如果为0,说明未签到,结束
                break;
            }else {
                //如果不为0,说明已经签到,计数器+1
                count++;
            }
            //把数字右移一位,抛弃最后一个bit位,继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //保存用户
        save(user);
        return user;
    }
}
